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		<title>Document</title>
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		<script>
			// 1. 类的继承
			// class Father {
			// 	constructor() {}
			// 	money() {
			// 		console.log(100);
			// 	}
			// }

			// class Son extends Father {}

			// let son = new Son();
			// son.money();

			class Father {
				constructor(x, y) {
					this.x = x;
					this.y = y;
				}
				sum() {
					console.log(this.x + this.y);
				}
			}

			class Son extends Father {
				constructor(x, y) {
					super(x, y); // 调用了父类中的构造函数
				}
			}

			let son = new Son(1, 2);
			let son1 = new Son(11, 22);

			son.sum();
			son1.sum();
		</script>
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